Is 30 years old still young?

Whether 30 is "young" is subjective and depends on the context.

Compared to someone who is 70, 30 is undeniably young. In terms of life stages, 30 is often considered the beginning of adulthood, with many people establishing careers, families, and long-term goals. However, compared to someone who is 20, 30 might feel older.

So there's no single answer. It's relative.